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P0420: Catalyst System Efficiency Below Threshold (Bank 1)
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P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
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Fault Codes
By System
Powertrain
Body
Chassis
Network
Common Codes
P0420: Catalyst System Efficiency Below Threshold (Bank 1)
P0300: Random/Multiple Cylinder Misfire Detected
P0171: System Too Lean (Bank 1)
P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
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Freeze Frame Data
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Have It Checked Soon
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Phone Connection Keeps Dropping
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Mazda
Mazda
Mazda models with official NHTSA recalls, fault code help and maintenance guides.
Recall data
NHTSA (United States)
Market
United States and Europe
Mazda models
121
323
626
6e
B-Series
CX-3
CX-30
CX-5
CX-50
CX-60
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Latest Mazda recalls
Mazda CX-50 recall: Trailer Hitches
Trailer Hitches · 2023-03-01
Mazda CX-5 recall: Air Bags:side/window
Air Bags:side/window · 2018-06-25
Mazda CX-5 recall: Trailer Hitches
Trailer Hitches · 2017-11-21
Mazda CX-5 recall: Exterior Lighting:headlights
Exterior Lighting:headlights · 2020-02-06
Mazda CX-5 recall: Visibility:windshield
Visibility:windshield · 2016-01-19
Mazda CX-5 recall: Fuel System, Gasoline:storage:tank Assembly:filler Pipe And Cap
Fuel System, Gasoline:storage:tank Assembly:filler Pipe And Cap · 2016-02-03
Explore Mazda
Fault codes
See all
→
P0420
Catalyst System Efficiency Below Threshold (Bank 1)
P0300
Random/Multiple Cylinder Misfire Detected
P0171
System Too Lean (Bank 1)
P0128
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
U0100
Lost Communication With ECM/PCM “A”
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